Thanks for the quick answer. I use the analog design environment to design the digital circuits I need. I run the transient analysis of the ADE using spectre APS. Later I plot the results through the virtuoso visualization and analysis XL . Ones the results are plotted I select the squared waveform I need. In the upper menu of the window of the Virtuoso visualization and analysis XL : Measurements>EyeDiagram. A window pops up and I fill the values. For the first simulation is fine. I always follow the same procedure: 1-Simulation>plot signals>select signal>eye diagram(as mentioned) 2-Circuit modification 3-Again simulation>plot signals>select signal>eye diagram 4-... Furthermore, i run a parametric simulation (two values) following the previous procedure and I get the eye diagram with as many eyes as parametric steps, that is fine. After i run a single non parametric simulation and the eye diagram corresponds to the parametric simulation. The problem persist when I close and reopen the ADE. I have to open and close cadence. I hope the information is sufficient now. Regards, M![]()
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